The CAS Registry Mumber 119490-77-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,4,9 and 0 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 119490-77: (8*1)+(7*1)+(6*9)+(5*4)+(4*9)+(3*0)+(2*7)+(1*7)=146 146 % 10 = 6 So 119490-77-6 is a valid CAS Registry Number.